gregbell/active_admin — pull request #965 by elia (2012-02-03 10:37:33+00:00)
Title: Fix FormBuilder#inputs content capturing

Without this change this would return an empty fieldset

```ruby
ActiveAdmin.register Member do
form do |f|
f.inputs 'Authentication' do
f.input :email

# when the following is false the block returns nil
if f.object.persisted?
f.input :password
f.input :password_confirmation
end
end
end
end
```